The resistivity of material is
(i) inversely proportional to the number density of the electron.
(ii) directly proportional to the average time between the collision
(a) (i) only correct (b) (ii) only correct (c) (ii) correct (i) wrong (d) none of this
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ans: (a) (i) only correct.
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Answer:(a) (i) only correct
Explanation: resistivity is inversely proportional to relaxation time ( (ii) ) and inversely proportional to number density of the electron ( (i) )
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